package com.didispace.chapter23;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.validation.Valid;

import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiOperation;

@Api(tags = "用户管理")
@RestController
@RequestMapping(value = "/users") //通过这里配置使下面的映射都在/users下
public class UserController {
    //创建线程安全的Map，模拟users信息的存储
    static Map<Long, User> users = Collections.synchronizedMap(new HashMap<Long, User>());
    
    /**
     * 处理"/users/"的GET请求，用来获取用户列表
     * @return
     */
    @GetMapping("/")
    @ApiOperation(value = "获取用户列表")
    public List<User> getUserList() {
        //还可以通过@RequestParam从页面中传递参数来进行查询条件或者翻页信息的传递
        List<User> list = new ArrayList<User>(users.values());
        return list;
    }
    
    /**
     * 处理"/users/"的POST请求，用来创建User
     * @param user
     * @return
     */
    @PostMapping("/")
    @ApiOperation(value = "创建用户", notes = "根据User对象创建用户")
    public String postUser(@Valid @RequestBody User user) {
        //@RequestBody注解用来通过绑定http请求中application/json类型上传的数据
        users.put(user.getId(), user);
        return "success";
    }
    
    /**
     * 处理"/users/{id}"的GET请求，用来获取url中id值的User信息
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    @ApiOperation(value = "获取用户详细信息", notes = "根据url的id来获取用户详细信息")
    public User getUser(@PathVariable Long id) {
        //url中的id可通过@PathVariable绑定到函数的参数中
        return users.get(id);
    }
    
    /**
     * 处理"/users/{id}"的PUT请求，用来更新User信息
     * @param id
     * @param user
     * @return
     */
    @PutMapping("/{id}")
    @ApiImplicitParam(paramType = "path", dataType = "Long", name = "id", value = "用户编号", required = true, example = "1")
    @ApiOperation(value = "更新用户详细信息", notes = "根据url的id来指定更新对象，并根据过来的user信息来更新用户详细信息")
    public String putUser(@PathVariable Long id, @RequestBody User user) {
        User u = users.get(id);
        u.setName(user.getName());
        u.setAge(user.getAge());
        users.put(id, u);
        return "success";
    }
    
    /**
     * 处理"/users/{id}"的DELETE请求，用来删除User
     * @param id
     * @return
     */
    @DeleteMapping("/{id}")
    @ApiOperation(value = "删除用户", notes = "根据url的id来指定删除对象")
    public String deleteUser(@PathVariable Long id) {
        users.remove(id);
        return "success";
    }
    
}
